Subaru Legacy 2003 Service Manual page 3085

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
VDC (DIAGNOSTICS)
19 CHECK VDCCM MOTOR DRIVE TERMINAL.
1) Turn ignition switch OFF.
2) Remove VDC connector cover. <Ref. to
VDC-19, REMOVE, VDCCM Connector
Cover.>
3) Connect all connectors.
4) Install motor relay and valve relay to relay
box.
5) Operate the ABS check sequence. <Ref.
to VDC-16, ABS Sequence Control.>
6) Measure voltage between VDCCM connec-
tor terminals.
Connector & terminal
(F87) No. 22 (+) — No. 1 ( − − − − ):
Does the voltage drop from between 10 V
and 13 V to less than 1.5 V, and rise to
between 10 V and 13 V again when carry-
ing out the check sequence?
20 CHECK MOTOR OPERATION.
Operate the check sequence. <Ref. to VDC-
19, VDC Sequence Control.>
Can motor revolution noise (buzz) be heard
when carrying out the check sequence?
21 CHECK POOR CONTACT IN CONNECTORS.
Turn ignition switch to OFF.
Is there poor contact in connector between
VDCH/U, relay box and VDCCM?
22 CHECK VDCCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the diagnostic trouble code.
Is the same diagnostic trouble code as in
the current diagnosis still being output?
23 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
Are other diagnostic trouble codes being out-
put?
Step Value
Drop from 10 — 13 V to less
than 1.5 V, and rise to 10 — 13
V again when carrying out the
check sequence.
Noise heard
There is poor contact.
Same DTC indicated.
Other DTC indicated.
VDC-112
Yes
Go to step 20. Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
Go to step 21. Replace VDCH/U.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
Repair connector. Go to step 22.
Replace VDCCM. Go to step 23.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
Proceed with the A temporary poor
diagnosis corre- contact.
sponding to the
diagnostic trouble
code.
No